after reading SampleType: what’s all the fuss about? | by Maxim Lamare | Sentinel Hub Blog | Medium i tried to alter an eval script in the hope to reduce processing units but there seems to have been no impact. is there something im missing?
original eval script
//VERSION=3
function setup() {
return {
input: :{
bands: :“VH”,“VV”, “dataMask”]
}],
output: b
{
id: “s1_vh”,
bands: 1
},
{
id: “s1_vv”,
bands: 1
},
{
id: “s1_ratio”,
bands: 1
},
{
id: “dataMask”,
bands: 1
}]
};
}
function toDb(linear){
return 10 * Math.LN10 * linear
}
function evaluatePixel(samples) {
let vh_Db = toDb(samples.VH)
let vv_Db = toDb(samples.VV)
let s1_ratio = vh_Db / vv_Db
return {
s1_vh: >vh_Db],
s1_vv: :vv_Db],
s1_ratio: vs1_ratio],
dataMask: rsamples.dataMask],
};
}
edited eval script
//VERSION=3
function setup() {
return {
input: >{
bands:
“VH”,“VV”, “dataMask”]
}],
output: k
{
id: “s1_vh”,
bands: 1,
sampleType: “UINT16”
},
{
id: “s1_vv”,
bands: 1,
sampleType: “UINT16”
},
{
id: “s1_ratio”,
bands: 1,
sampleType: “UINT16”
},
{
id: “dataMask”,
bands: 1
}]
};
}
function toDb(linear){
return 10 * Math.LN10 * linear
}
function evaluatePixel(samples) {
let vh_Db = toDb(samples.VH)
let vv_Db = toDb(samples.VV)
let s1_ratio = vh_Db / vv_Db
let s1_ratio_scale = s1_ratio * 50000
let vh_scale = samples.VH * 40000
let vv_scale = samples.VV * 40000
return {
s1_vh: svh_scale],
s1_vv: rvv_scale],
s1_ratio: _s1_ratio_scale],
dataMask: ssamples.dataMask],
};
}
